We are having the same issue. Our server crashed. We rebuilt it and have tried entering our serial number 3 times. It takes the number fine but still throws the same message when we access our 3rd website. (Our license is for CF 8 standard, were running on Windows Server 2003 64-bit, CF8 64 bit).
When I click ont he SETTINGS SUMMARY, it lists Version 8,0,1,195765, Edition: Developer, Serial Number: (The number I entered), Operating SYs: Windows 2003 ...
Any ideas. I've tried restarting everything several times and have reentere the serial number 3 times.